{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31407", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.086Z", "datePublished": "2026-04-06T07:38:19.712Z", "dateUpdated": "2026-08-05T12:22:16.533Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:16.533Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: add missing netlink policy validations\n\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\n\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\n\nQuoting the reporter:\n nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\n value directly to ct->proto.sctp.state without checking that it is\n within the valid range. [..]\n\n and: ... with exp->dir = 100, the access at\n ct->master->tuplehash[100] reads 5600 bytes past the start of a\n 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n UBSAN." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Reachability is through NETLINK_NETFILTER ctnetlink messages sent by a local process. Later packet processing can trigger the bad state or expectation, but the attacker must first inject the malformed conntrack/expectation attributes locally.\nAC:L - The bug is triggered with crafted netlink attributes and does not require winning a race. The attacker can create the relevant conntrack/expectation state and matching traffic in a controlled network namespace.\nPR:L - nfnetlink requires CAP_NET_ADMIN in the socket's network namespace. Because this capability is reachable via user and network namespaces on affected deployments, this is low privilege rather than high privilege.\nUI:N - No victim action is required after the attacker can send the netlink request. The attacker can trigger the vulnerable paths directly.\nS:U - The impact remains within the kernel security authority. This is not a VM escape or cross-authority boundary bypass.\nC:H - The missing validation permits attacker-controlled out-of-bounds reads, including indexing beyond the master nf_conn tuplehash and SCTP state tables. This is not strictly bounded to a harmless few bytes, so high confidentiality impact is defensible.\nI:N - The investigated paths show out-of-bounds reads and invalid in-object state assignment, not an out-of-bounds write or control-flow overwrite. No direct integrity-impacting primitive was identified.\nA:H - The out-of-bounds reads are attacker-triggerable and were reported as UBSAN-confirmed slab out-of-bounds accesses. Such kernel faults can produce an oops or panic, so availability impact is high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_conntrack_netlink.c", "net/netfilter/nf_conntrack_proto_sctp.c" ], "versions": [ { "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "e7b5766693477c52424cc6c79dd30a7a9c7db52c", "status": "affected", "versionType": "git" }, { "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "78bba9f73942aa7dca47d817d8cec0fb9b443b70", "status": "affected", "versionType": "git" }, { "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "be88a337bf07afb1ee173f1099294d1b7ab3fefe", "status": "affected", "versionType": "git" }, { "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "c5e918390002edf0cff80a0e7ce1f86f16a9507c", "status": "affected", "versionType": "git" }, { "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "9174d28f3f15d8c4962f5980c0be167633880443", "status": "affected", "versionType": "git" }, { "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "67c53c1978cef3c504237275e39c857e2f6af56e", "status": "affected", "versionType": "git" }, { "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "0fbae1e74493d5a160a70c51aeba035d8266ea7d", "status": "affected", "versionType": "git" }, { "version": "a258860e01b80e8f554a4ab1a6c95e6042eb8b73", "lessThan": "f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nf_conntrack_netlink.c", "net/netfilter/nf_conntrack_proto_sctp.c" ], "versions": [ { "version": "2.6.27", "status": "affected" }, { "version": "0", "lessThan": "2.6.27", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.136" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.18.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.19.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c" }, { "url": "https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70" }, { "url": "https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe" }, { "url": "https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c" }, { "url": "https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443" }, { "url": "https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e" }, { "url": "https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d" }, { "url": "https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05" } ], "title": "netfilter: conntrack: add missing netlink policy validations", "x_generator": { "engine": "bippy-1.2.0" } } } }